/* SPDX-License-Identifier: BSD-2-Clause */
/*	$NetBSD: getopt.h,v 1.4 2000/07/07 10:43:54 ad Exp $	*/
/*	$FreeBSD$ */

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * This file is a slightly modified version of `getopt.h` from FreeBSD's
 * libc. The changes were made to fit it to Unikraft and nolibc.
 * These changes were done by Simon Kuenzer <simon.kuenzer@neclab.eu> and
 * they do not affect the original license terms of this file.
 */

#ifndef _GETOPT_H_
#define _GETOPT_H_

/*
 * GNU-like getopt_long()/getopt_long_only() with 4.4BSD optreset extension.
 * getopt() is declared here too for GNU programs.
 */
#define no_argument        0
#define required_argument  1
#define optional_argument  2

struct option {
	/* name of long option */
	const char *name;
	/*
	 * one of no_argument, required_argument, and optional_argument:
	 * whether option takes an argument
	 */
	int has_arg;
	/* if not NULL, set *flag to val when option found */
	int *flag;
	/* if flag not NULL, value to set *flag to; else return value */
	int val;
};

int getopt_long(int nargc, char * const *nargv, const char *options,
		const struct option *long_options, int *idx);
int getopt_long_only(int nargc, char * const *nargv, const char *options,
		     const struct option *long_options, int *idx);
int getopt(int nargc, char * const *nargv, const char *options);

extern char *optarg;			/* getopt(3) external variables */
extern int optind, opterr, optopt;
extern int optreset;			/* getopt(3) external variable */

#endif /* !_GETOPT_H_ */
